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- Key Card vs S
Arculus Key Card vs CoolWallet S
What Key Card does better (4) and where S wins (6) — every spec side by side.
Why is Key Card better than S?
- Secure Element certificationEAL6+ vs EAL5+
- NFCYes · S: No
- Warranty (months)24 vs 122×
- FIDO2 / U2F security keyYes · S: No
Why is S better than Key Card?
- ScreenNo · Key Card: Yes
- Weight15 g vs 6 g2.5×
- Upgradable firmwareNo · Key Card: Yes
- USBNo · Key Card: Yes
- BluetoothNo · Key Card: Yes
- Built-in batteryNo · Key Card: Yes
Specifications
Side by side
| Security | ||
| Secure Element chip | Yes | Yes |
| Secure Element certification | EAL6+ | EAL5+ |
| Air-gapped signing | No | No |
| 100% air-gapped | No | No |
| Supply-chain & tamper protection | Yes | Yes |
| Anti-klepto (anti-exfil) signing | No | No |
| Firmware & open source | ||
| Open-source firmware | No | No |
| Source code available | No | No |
| Reproducible builds | No | No |
| Upgradable firmware | No | Yes |
| Firmware update via | — | USB |
| Bitcoin-only firmware / edition | No | No |
| Device lock | ||
| PIN lock | Yes | Yes |
| PIN entered on the device | No | No |
| Duress PIN / decoy wallet | No | No |
| Brick / wipe PIN | No | No |
| Wipe after failed attempts | No | No |
| Time-delayed unlock | Yes | No |
| Anti-phishing words | No | No |
| Keys & backup | ||
| BIP39 passphrase | No | No |
| Shamir backup (SLIP-39) | No | No |
| Seed XOR | No | No |
| BIP85 child seeds | No | No |
| 24-word seed | Yes | Yes |
| SeedQR backup | No | No |
| microSD backup | No | No |
| NFC backup card | No | No |
| User-added entropy (dice) | No | No |
| Stateless use (no stored keys) | No | No |
| Multiple seeds on one device | No | No |
| Bitcoin features | ||
| Multisig | No | No |
| Taproot | — | No |
| Miniscript | No | No |
| Message signing | No | No |
| Coin control | No | No |
| Own node connection | No | No |
| Tor support | No | No |
| Replace-by-fee | No | No |
| Silent Payments | No | No |
| Spending limits | No | No |
| Testnet | No | No |
| Supported assets | ||
| Altcoins & tokens | Yes | Yes |
| Bitcoin only | No | No |
| Connectivity | ||
| Signing connectivity | NFC | USB, Bluetooth |
| USB | No | Yes |
| USB-C | — | No |
| Bluetooth | No | Yes |
| NFC | Yes | No |
| QR code camera | No | No |
| Animated QR (UR) | No | No |
| microSD signing | No | No |
| Screen & input | ||
| Screen | No | Yes |
| Screen size | — | 1.03″ |
| Screen type | — | E-Ink |
| Touchscreen | No | No |
| Colour screen | No | No |
| Gorilla Glass | — | No |
| Controls | — | Buttons |
| QWERTY keyboard | No | No |
| Battery & power | ||
| Built-in battery | No | Yes |
| Battery capacity | — | 15 mAh |
| Removable battery | — | No |
| Wireless charging | — | No |
| Design | ||
| Weight | 15 g | 6 g |
| Length | 85.6 mm | 85.6 mm |
| Width | 54 mm | 54 mm |
| Thickness | — | 0.8 mm |
| Materials | Plastic & Stainless Steel | Plastic & Metal |
| Water / dust resistance | Yes | Yes |
| Several colours available | No | No |
| Warranty (months) | 24 | 12 |
| Assembled in | USA | Taiwan |
| DIY build possible | No | No |
| Apps | ||
| Official apps | Android, iOS | Android, iOS |
| Desktop app | No | No |
| Mobile app | Yes | Yes |
| Compatible third-party wallets | 0 | 0 |
| Other features | ||
| FIDO2 / U2F security key | Yes | No |
| Password manager | No | No |
